Final answer:
The acceptable wiring method for receptacles under a raised computer room floor is a three-wire system that includes live/hot, neutral, and ground wires, with the appliance and neutral wire grounded, and should incorporate a Ground Fault Circuit Interrupter for additional safety.
Step-by-step explanation:
The wiring method acceptable for supplying power to receptacles under a raised computer room floor must adhere to safety standards that guard against thermal and shock hazards. Utilizing a three-wire system is standard, composed of live/hot, neutral, and ground wires. This system ensures that the neutral wire and case of the appliance are grounded for safety. Additionally, a Ground Fault Circuit Interrupter (GFCI) is highly recommended as it prevents shock by detecting the loss of current to unintentional paths, such as through water or a person's body.
These wiring systems are designed with conducting wires which are shielded by rubber and plastic to act as insulators, thus preventing electricity from escaping outward. Ensuring proper grounding in the system is crucial; a ground connection allows circuitry to trip in case of a fault, prompting immediate repairs and increasing safety, particularly in environments such as a kitchen where water might be present.